How do you write an equation of the line that passes through the given points (0,0), (4,-20)?
The point-slope formula can be used to write an equation for this line. First, we must determine the slope. The slope can be found by using the formula:
Substituting the values from the two points in the problem gives:
The point-slope formula states:
Substituting the slope we calculated and the second point gives:
We can also substitute the slope we calculated and the first point giving: